Longitudinal \(\bar{\Lambda}_0\) polarization in heavy-ion collisions as a probe for QGP formation

  • G. HerreraEmail author
  • J. Magnin
  • L. M. Montaño
theoretical physics


We present an analysis of the longitudinal \(\bar{\Lambda}_0\) polarization in ultrarelativistic heavy-ion collisions. The polarization of \(\bar{\Lambda}_0\)’s coming from the decay chain \(\bar{\Xi}\rightarrow \bar{\Lambda}_0 + \pi\) exhibits a very well differentiated behavior depending on the production region of the primordial \(\bar{\Xi}\)’s. This effect reflects the different values of the \(N_{\bar{\Xi}}/N_{\bar{\Lambda}_0}\) ratio in the QGP region, where nucleon-nucleon interactions take place in a hot and dense environment, and the peripherical region, in which ordinary nucleon-nucleon interactions occur. An increase in the longitudinal \(\bar{\Lambda}_0\) polarization signals a strangeness enhancement which is thought of as a property of the QGP phase.


Field Theory Elementary Particle Quantum Field Theory Particle Acceleration Production Region 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.


  1. 1.
    For a recent review on the suject, see U.W. Heinz, Hunting down the Quark Gluon Plasma in relativistic heavy-ion collisions, Proceedings of the Conference on Strong and Electroweak Matter (SEWM 98), Copenhagen, Denmark, edited by J. Ambjorn, P. Damgaard, K. Kainulainen, R. Rummukainen (World Scientific Publ. Co., Singapore 1999), p. 81Google Scholar
  2. 2.
    M. Jacob, J. Rafelski, Phys. Lett. B 190, 173 (1987); M. Jacob, Z. Phys. C 38, 273 (1988)Google Scholar
  3. 3.
    P. Koch, B. Müller, J. Rafelski, Phys. Rep. 142, 167 (1986)Google Scholar
  4. 4.
    J. Adams et al. (STAR Collaboration), Phys. Rev. Lett. 92, 182301 (2004)Google Scholar
  5. 5.
    T. Äkesson et al. (ISR-Axial-Field Spectrometer Collaboration), Nucl. Phys. B 246, 1 (1984)Google Scholar
  6. 6.
    A. Ayala, E. Cuautle, G. Herrera, L.M. Montaño, Phys. Rev. C 65, 024902 (2002); Rev. Mex. Fis. 48, 549 (2002)Google Scholar
  7. 7.
    B. Povh, C. Scholz, K. Rith, F. Zersche, Particles and nuclei: an introduction to the physical concepts, p. 65 (Springer, Berlin 1995)Google Scholar
  8. 8.
    J.P. Blaizot, J.Y. Ollitrault, Phys. Rev. Lett. 77, 1703 (1996)Google Scholar
  9. 9.
    I. Abt et al. (Hera-B Collaboration), Eur. Phys. J. C 29, 181 (2003)Google Scholar
  10. 10.
    C. Adler et al. (STAR Collaboration), Phys. Rev. Lett. 89, 092301-1 (2002)Google Scholar
  11. 11.
    J. Letessier, J. Rafelski, A. Tounsi, Phys. Lett. B 389, 586 (1996)Google Scholar
  12. 12.
    A.D. Panagiotou, Phys. Rev. C 6, 1999 (1986)Google Scholar

Copyright information

© Springer-Verlag Berlin/Heidelberg 2005

Authors and Affiliations

  1. 1.Depto. de Física del Centro de Investigación y de Estudios Avanzados del IPNMéxico D.F.México
  2. 2.Centro Brasileiro de Pesquisas FísicasRio de JaneiroBrazil

Personalised recommendations